Fountain-pen.



No. 773,847. PATENTED NOV. 1, 1904.

J. BLAIR.

FOUNTAIN PEN.

APPLICATION FILED APB..16. 1904.

N0 MODEL.

J'T j" wamwm 9 1 @51 Patented November 1, 1904.

ATENT rricn.

JOHN BLAIR, OF BROOKLYN, NEW YORK.

FOUNTAIN-PEN.

SPECIFICATION forming part of Letters Patent No. 773,847, dated November1, 1904.

Application filed April 16, 1904:.

T0 aZZ whom it may concern:

Be it known that I, JOHN BLAIR, a citizen of the United States, residingat Brooklyn, in the county of Kings and State of New York, have inventednew and useful Improvements in Fountain-Pens, of which the following isa specification.

In the writing-pens in which a supply of ink is carried in a reservoirin the barrel of the pen and intended to be fed down to the pen-point inthe act of writing there is still more or less ditficulty in regulatingthe feed of the ink to the exact demand. There is also a liability toflooding and to the exudation of the ink through the joint connectingthe pensection with the barrel. This invention is designed to remedythese defects. A great desideratum in pens of this class is a means forfilling the ink-reservoir in the pen-barrel without employinga separatefiller and without removing the pen-section. My present inventionincludes a very simple device for effecting this object.

The accompanying drawings fully illustrate the invention, its variousfeatures being referred to by letters, similar letters denotingcorresponding parts in the several views.

Figure 1 is a side view of the pen, partly in section and with the capon the rear end. Fig. 2 is an enlarged plan of a cross-section of thenozzle or pen-section on line at w of Fig. 1. Fig. 3 is an enlarged planof a cross-section on lineg y of Fig. 1, and Figiis an enlargedcross-section on line 2 2 of Fig. 1.

The letter A designates the barrel of the pen, which incloses thereservoir holding the supply of ink, and a is the removable threadedplug at the rear end of the barrel.

B indicates the pen-section of a fountainpen or, as shown in thedrawings, the pointsection of a stylographic pen. It hasathreaded end 6to engage the inner threaded end of the barrel A. This point-section isprovided with an exterior annular recess 6 at the base of the conicalpoint 6 and with a recess t between its middle part and its rearthreaded end 6. An air connection 6" is made across these threads toconnect the recess 5 with the reservoir in the barrel.

One or more air-ducts b are made length- Serial No. 203,452. (No model.)

wise from the recess 6 through the pen-see tion to the recess 6 Acontinuous air connection is thus established between the exteriorrecess 5 and the ink-reservoir by which a uniform air-pressure ismaintained and flooding and leakage are prevented.

6 is the ink-duct through the point-section, in which the feed-bar b islocated.

On thethreaded rear end of the barrel A is the threaded plug a alreadymentioned. The threads and part of the stem of this plug are cut off atone or more places to form an airpassage (0 when the plug is partlyremoved.

O is a cap having a small vent-hole c, preferably through its otherwiseclosed end. This cap is employed to cover and protect the nib of the penwhen the pen is not in use and is also made to fit evenly and snuglyover the rear end of the barrel, covering, of course, the plug a.

In order to fill the ink-reservoir, the plug (6 is unscrewed about ahalf-turn or just sufficient to allow the passage of air through thechannel a. The cap O is then put on and pressed down its full length.The nib or point of the pen is then inserted in the ink, when bycovering the hole 0 with the finger and slowly drawing the cap off theink will be drawnup by suction into the ink-reservoir. The plug is thenscrewed down tightly and the operation of filling the pen is completed.

In order to prevent a failure of the tractive force by reason ofimperfect joining of the inner surface of the cap with the barrel,either by the stretching of the cap or defective construction, I form agroove D around the body A near its rear end, and insert in said groovea collar or packing (Z, oflinen,wax ,or other suitable substance, whichwill insure an air-tight connection between the cap and the barrel. Ifnecessary, there may be two or more of these collars provided.

Havingnow described the invention and the manner of using it, what Iclaim, and desire to secure, is-

I. In a fountain-pen a point-section having a body portion and aninterior threaded portion provided with a longitudinal air-channel, saidinterior portion having a recess between said body portion and saidthreaded portion I00 10 section and air-ducts connecting said exteriorrecess with said internal annular recess as herein described.

In testlmony whereof I have signed my name to this specification in thepresence of two subscribing W tnesses.

JOHN BLAIR.

l/Vitnesses:

MAY HoLLINesHEAD, RICHARD F. OLPHERTS.

